Pyrazole
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Basic information
- CAS
288-13-1- Standard SMILES
c1cn[nH]c1- InChIKey
WTKZEGDFNFYCGP-UHFFFAOYSA-N- Molecular formula
- C3H4N2
- Average molar mass
- 68.08 g/mol
- Monoisotopic mass
- 68.03744813
Overview
1H-pyrazole is the 1H-tautomer of pyrazole. It is a conjugate base of a pyrazolium. It is a conjugate acid of a pyrazol-1-ide. It is a tautomer of a 3H-pyrazole and a 4H-pyrazole.
Names & identifiers
- Preferred name
- Pyrazole
- IUPAC
- 1H-pyrazole
- English name
- Pyrazole
- Molecular formula
- C3H4N2
- Molecular weight
- 68.08
Names & synonyms
pyrazole1H-Pyrazole288-13-11,2-diazolePyrazol1H-pyrazol3QD5KJZ7ZJDTXSID2059774NSC45410NSC-45410CHEBI:17241RefChem:6183
Show more names
Pyrrazoleα-yrromonazolePyrazole, pure, 98%Ryrazole1,2-DIAZOL
DTXCID4037873CHEBI:14973206-017-1MFCD00005234diazoleHpzEINECS 206-017-1UNII-3QD5KJZ7ZJ
Database identifiers
- CAS
288-13-1- PubChem CID
- 1048
- DTXSID
DTXSID2059774- ChEMBL
CHEMBL15967- ChEBI
CHEBI:17241- UNII
- 3QD5KJZ7ZJ
- EC Number
- 206-017-1
- Nikkaji
- J5.452F
Properties
Computed structural propertiesFilling in
- XLogP
- 0.3
- Topological polar surface area
- 28.7 Ų
- Hydrogen bond donors
- 1
- Hydrogen bond acceptors
- 1
- Rotatable bonds
- 0
- Heavy atoms
- 5
- Formal charge
- 0
- Complexity
- 28.1
Experimental & physicochemical properties
Chemical ClassesNitrogen Compounds -> Pyrazoles
DrugsPharmaceuticals -> Listed in ZINC15
SpringerMaterials Properties15N nuclear magnetic resonance spectrum
LogP0.13
Vapor Pressure1.19 [mmHg]
Physical Description
Liquid
Solid with an odor like pyridine; [Merck Index] Colorless crystalline solid; [Sigma-Aldrich MSDS]
Dissociation Constants2.48 (at 25 °C)
Collision Cross Section125.47 Ų [M+H]+ [CCS Type: DT; Method: stepped-field]
Physicochemical properties
- Melting point
Safety & regulation
Safety information is for reference only and does not replace the supplier’s Safety Data Sheet (SDS), applicable regulations, or professional assessment.
GHS classification
GHS Classification
This chemical does not meet GHS hazard criteria for 0.4% (1 of 265) of reports.
Danger
H302 (98.9%): Harmful if swallowed [Warning Acute toxicity, oral]
P260, P261, P262, P264, P264+P265, P270, P271, P273, P280, P301+P317, P302+P352, P304+P340, P305+P351+P338, P305+P354+P338, P316, P317, P319, P321, P330, P332+P317, P337+P317, P361+P364, P362+P364, P403+P233, P405, and P501 (click each P-code to see the statement)
Aggregated GHS information provided per 265 reports by companies from 21 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
Hazard information
Regulatory Information
Chemical: 1H-Pyrazole
1H-Pyrazole is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of 1H-Pyrazole are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)
Status: Active Update: 26-02-2019 https://echa.europa.eu/registration-dossier/-/registered-dossier/23403
Pyrazole: Does not have an individual approval but may be used under an appropriate group standard
Hazards Summary
Equivocal evidence of teratogenicity in mice; Teratogenic effects observed in intraperitoneal study of rats (route of administration not relevant to humans); [REPROTOX] Causes zonal hepatitis and coma in oral lethal-dose studies of rats; [RTECS] A skin and strong eye irritant; Harmful by ingestion; Teratogenicity observed in rats; [Sigma-Aldrich MSDS]
Hazard Classes and CategoriesAcute Tox. 4 (98.9%)
Toxicology
Chemistry & industry
Pharmacology
MeSH Pharmacological ClassificationCompounds or agents that combine with an enzyme in such a manner as to prevent the normal substrate-enzyme combination and the catalytic reaction.
Uses & manufacturing
UsesUsed as a chelating agent and in organic synthesis; [Merck Index]
U.S. Production2023: 75,000 - <500,000 lb
Consumer UsesEtching agent
Industry UsesOther
General Manufacturing Information
All Other Chemical Product and Preparation Manufacturing
1H-Pyrazole: ACTIVE
Applications
UsesPyrazole is used in organic synthesis and asa chelating agent.
General DescriptionPyrazine is a heterocyclic crystalline aromatic compound with a five-membered ring containing three carbon atoms and two nitrogen atoms. It is a symmetricdiazine.
Upstream & downstream products
Upstream raw materials
Downstream products
Related reactions
1,293 records
Compound notes
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